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Thread: Iron Stains Gone--Water Just Turned Green Tint

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    Iron Stains Gone--Water Just Turned Green Tint

    ok here's my issue:
    Salt pool
    Opened pool to liner stain.
    Chlorine reduced to 0- added Stain Free= clear liner overnight
    Added 1 qt of Jacks Magic Magenta Stuff and slowly start adding chlorine (bleach)
    adjusted ph with washing soda plus
    added CYA
    now 2 days later the pool water turned a light tint of green

    test readings are:
    FC = 4
    CC= 1
    TC= 5
    ph = 7.8
    T/A = 70
    CH = 50
    CYA = 50
    Temp 80 F

    I did notice that the DE filter is approaching the time to backwash

    Any suggestions on my next course of action?

    thanks in advance.
    Don
    Fiberglass Trilogy Pool,
    15x34 8900 gal.
    Pentair 1hp Super-Flo Pump
    Pentair CC100 Cartridge Filter, Pentair "Legend" Cleaner

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
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    Re: Iron Stains Gone--Water Just Turned Green Tint

    We don't recommend using Jack's Magenta Stuff. Use Blue, Pink, or Purple instead. They are much more effective. Sequestrants based on HEDP, phosphonic acid, or phosphonic acid derivatives are the best. There are several brands with this family of ingredients, some of which are noticeably less expensive.

    I am assuming the water is a clear transparent green. If so the coloring is caused by metals in the water and a sequestrant level that is too low. The stain remover takes the iron off the walls of the pool and puts it in the water. Sequestrant binds to the metals and holds them in solution. Without sequestrant you can have a variety of effects, including green water and stains returning.

    One thing you can do quickly to reduce the chances of any stains forming is to lower the PH down to around 7.2 to 7.4. Then work on getting some more sequestrant into the water, preferably one of the recommended types.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Iron Stains Gone--Water Just Turned Green Tint

    Ok thanks. My local pool store doesn't stock the purple stuff - they recommend the magenta stuff for the SW pools. They said it was higher concentrate and would take less volume for my pool size. I actually bought 2 bottles. Would it be acceptable to use the remaining bottle as the sequestering agent this time? I will drop the ph down as you suggest and add the sequestering. Should I let the chlorine drift back lower during this process?
    Fiberglass Trilogy Pool,
    15x34 8900 gal.
    Pentair 1hp Super-Flo Pump
    Pentair CC100 Cartridge Filter, Pentair "Legend" Cleaner

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Iron Stains Gone--Water Just Turned Green Tint

    Yes, Magenta is better than nothing, but not nearly as good as the other three.

    Your FC level is reasonably low already, I would leave it around that area for now.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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